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The Q::S implementation that I qualified as "just a bit vector": SuDoKu Solver [perlmonks.org]. I don't know if you agree with that. A literal vector implementation could be faster than Q::S, as there'd be less overhead, etc.

I haven't worked on this much since my original post, and I haven't made any breakthroughs with Q::S on it. I got distracted into AI::Prolog, which also looks interesting. I guess I'm more interested in how to ask the question (ala Prolog) than what the answer actually looks like.

Perhaps your interest will spur me on to put aside the real world again and revisit my Perl Hermit Camp.